Bevel-gear transmission gearing



ug. 114, i923.

D. E. ROSS BEVEL GEAR TRANSMISSION GEARING Filed April 3, 1920 A f f 2 f f f y S\/\ MK 1 :that the following is a full, clear, and exact Patented Aug. i4, i223. i

narran stares heeft??? DAVID E. ROSS, OE LAFAYETTE, INDEANA.

BEVEL-GEAR TRANSMSSON GEARING.

Application led April 3,

To @ZZ whom it concern: Y

Be it known that l, Divin E. Ross, a citizen ot the United States, residing at La- Yfayette, in thetcounty of rlippecanoe and State of Indiana, have invented certain new and useful Jimprovements Vin Bevel-Gear Transmission Gearing; and l hereby declare description thereof, reference being had to the accompanying drawings, which 'form part of this specification. Y Y

This invention is a novel improvement in gearing for transmitting power Jfrom a driving to a driven member. Its object is to make a reducing gear connection between such members, at the same time providing a positive constant geared relation between the driving and driven part wherebythe speed of rotation of the driving part may be reduced in transmission to the driven part to any desired predetermined extent or ratio,-

vand consequently the torque transmitted 'from the driving to the driven part augmented to a corresponding' extent.

l will explain the invention with reference to ,the accompanying drawings which illus# trate a practical embodiment thereof Sullicient to enable anyone skilledfi'n the art to adapt and use the saine g' and then summarize in theclaims the essentials ofthe' invention,

and novel lfeatures ot construction, and novel y combinations of parts tor all ot which protection is desired.

In said drawings Fig. 1 is a sectional elevation of a transmission gearing on line l-1, Fig. 2. v

Fig 2 is a transverse sectional view thereof on line 2 2, `Fig. l. Y

In the 'form shown the primemover l may be the shaft of an engine,for driven by any suitable motor, not shown.

This shaft carries a bevel gear l, which meshes with oppositely disposed beveledY driving`V gears 2 and `V3, which may be mounted on or in any suitable support; and are shown as rotatably .journaled upon the inner ends of axially alined axle members or shafts 9, 9a respectively, Vwhich may be supported in any suitable manner. Customaril'y all the gearing would be enclosed in a protecting housing, not shown, which may be such as 1s commonly employed to house the transmission gearing of automobiles.

In the example shown the driving gear 2 has formed on or rigidly connected with its inner face a smaller bevel gear 2, and drivieee. serial No. 370,906.

ing gear?) has formed on or rigidly co'n nected to its inner face a smaller bevel gear 3a opposite bevel gear 2, lnterposed between and meshing with bevel gears 2, 3 are a series of planetary gears Lia, which are journaled on suitable spindles 1lb in a driven member or support 1l; the member 4t is rotatably supported concentric to the shai'ts 9, 9 by any suitablemeans.

Y,The member 4l is shown as rotatably supported in or upon the Vhubs ot a pair ot smaller beveled gears 5, 5a, which are respectively ixedly mounted upon the inner ends ot the shafts 9, 93; and interposed between and meshing with the gears 5, 5a are arseries of smaller planetary gears 6, which are loose on the spindles 4th and located between the'shatts 9, 9 and the gears el, rlhe opposed bevel gears 5, 5, and the bevel gears C, 6, meshing therewith form a compensating gear connection between the shaft meinbers 9, 9, such compensating gear acting in' the well known manner.

ln the example shown in `Figs'. l and 2, the fears 2 and 3 have a different number o' teeth according to the desired extent of reduction et' speed and augmentation ot torque. For example, pinion l makes say three revolutions to one of gear 2; gear 2 has, say, 4,9tecth and gear 3, say, Oteeth, so gear 2 Vwill gainV one tooth on gear 3 at each revolution ot gear 2; thus gear 2 will make 50 revolutions inthe time that gear 3 makes 4:9 revolutions.

Assumino that gears 2 and 3 have a dit'- ferent nuniber of teeth,`as stated; and that the gears 2u and 3 are similar in size and in number of teeth, then the planetary gears 4 will take up orbital movement in the direction of rotation of the faster gear2; and

Vwill make one complete orbital revolution for every i9 revolutions o'lythe gear 2.

This orbital movement of the planetary gears la is transmitted through the driven member t to the compensating gear 5, 6, 6a) which will cause the axle members or shaft sections 9, 9a to rotate with the driven member at the orbital speed of the planetary gears Ala.

' ln the: example given, the prime mover shaft l makes 3 rotations to one of the gea-r 2; and the latter makesd) rotations to one complete orbital movement ot the planetary gears or one rotation of the driven member 1 1. Consequently the driven member only rotates once, in the example shown, for every the driving member.

The ratio of speed between the driving members 2 and 3 and driven member l depends upon the ratios ot the gearing; and by va-V rying the number ot teeth in the gears l and 2 and 3; or 2 and 3; or 2a, 3a; or all; the

' ratio otl reduct-ion of speed and ampliiication ot torque between the prime mover l and driven shafts 9, 9 can be varied.

The planetary gears and driven member will always taire up rotation in the direction of the intermediate gear 2L or 3 whose teeth' move fastest. Obviously the gears 2, 3 may be made with thesame number ot teeth and the gears 21,3 made with a different numberot teeth and the eiiect would be the same, it the proportionate change in gearing was preserved.

Where the opposed gears as 2, and 3; or 2, 3a have diti'erent numbers oit teeth and are axially alined, it would theoretically, and practically in some eases, be better to have the axis or axes ot the intermediate gear or gears meshing therewith inclined slightly to the axes of the opposed gears; as this would enable such intermediate. gear or gears to mesh uniformly with thev teeth ot' both the opposed gears, without any possibility ot' clashing; whereas it the opposed' gears (as 2.and 3) have the same axial center, but diii'erent numbers ot teeth, and the intermediate gear, as l, isjournaled perpendicular to the axes ot the opposed gears,

there is a tendency to clash which tendency would increase in proportion to the difterence in the number ot the teeth ot the op# posed Gears.

It is obvious that the invention is not limited to any particular size or arrangement or proportion ot' the gearing, all ot' which could be varied in accordance with the difference in speed or augmentation ot' torque which it is desired to obtain between the driving and the driven parts. The direction ot rotation of: the driven. member always follows the direction ot the orbital rotation of the planetary gears; and the planetary gears take up orbital movement in the direction ot' rotation ot the fastest moving gear teeth with which they mesh.

In the example shown, the planetary gears move in the direction ot' rotation ot the gears 2, because the gear 2 has a less number of teeth.V By varying the gear ratios between the driving member and the driven member any predetermined Vrelative reduction Yof speed may be obtained betweenthe driving and the driven members, either forward or reverse.`

lWhat lclaim is:

l. n a transmission gearing ot' the character speciiied; two opposed driving bevel gears; a prima-ry driving sha-tt; a pinion thereon directly meshing' with said opposed bevel gears; opposed smaller beveled gears iixedly connected with theV opposed driving gears; a driven member; a pair ot opposed axially alined shaft sections; a compensating gearing connecting said shaft sections; and connected with the driven member; and planetar f gears connected with the driven member and meshing VAwith the opposed smaller beveled gears, substantially as described. i'

2. il transmission gearing comprising opposed bevel driving gearsot dillerent size having a delinite positive relative speed ratio; a driven member; smaller opposed bevel gears connected with the said driving gears; and planetary gearsv connected with the driven member and meshing lwith the Vopposed'smaller bevel' gears; with apair ot opposed axially alined shaft sections; and a compensating' gearing between said shaft sections and connected with the driven inember, substantially as described;

3. A transmission gearing oit' the character specified comprising opposed positively and oppositely driven gearsV 'having a definitie Vrelative speed ratio; a pairot driven members opposed bevel gears connected with the said positively driven gears; a compensate ing gearing connected with the said drive-n members and planetary gears connected'with the compensating gearing and meshing with said opposed bevelgea-rs; at least one ot the Yopposed gears in one pair having-'a less number oi?n teeth than the other gear in said pair.

ln testimony that I claim the foregoing as my own, l atlix my signature., Y c v DAVIDE. ROSS. 

